Engine-valve.



I. T. CURTIS.

ENGINE VALVE.

APPLICATION man ocT, ls. |911.

Comp-:vasion Patented July 23, 1918.

f) 9 y Z 2f I /NZa/(e :"NMZ] .l l Ev/zausl Inventor by M Attrney's /l I I ff@ Witnesses` y UNTED STATES lAflENl4 OFFICE.

JESSE TEMPLE CURTIS, OF BEMENT, ILLINOIS, ASSIGNOR/ OF' ONE-#HAIJFTO F.' LYNN MCCLURE, OF SEBRING, OHIO.

ENGINE-VALVE.

Specification of Letterslatent.

Fatentediluly, 23, :1918.

To all whom it may conce/"n:

'Be it known that I, J'nssn T. CUn'rls, a citizen el' the United States, residingat Bement, in the county oit Piatt and State of Illinois,`,have invented a new and useful Engine-Valve, of which the following is a specification.

rlllie present invention appcrtains to valves for linternal explosion origines, and aims to provide a novel and improved valve structure toenhance the operation, especially in high speeds, which are ordinarily handicapped by the present types oit' valves.

The invention has :for its object the provision o1'l a novel valve structure wherein the intake and exhaust valves cooperate in` an effective manner, in connection with novel means for operating valves.

A iiiirther object ot' the invention is to avoidY the objections to ordinary puppet exhaust valves, which frequently warp, and burn and pit at their seats.

l/Vith the :foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combi- 4 nation and arrangement of parts and in the details of eonstri'lction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit ot''the invention.

f The invention is illustrated in the accompanying drawing, wherein:

Figure 1 is' a section ofan engine equipped 'withvthe valveeonstruction, portions being shown in elevation.

Fig. 2 is a section on the line oi Fig. 1. y

In the drawing, there isillustrated an internal explosion engine having one cylinder, but it will be readily appreciated, that the valve structure can be duplicated `for multiple cylinder engines, the operation oit each valve structure being the saine and in timed relation with the corresponding piston. lVitliin the cylinder 1, the piston 2 reciprocates as usual, being connected by the connecting rod 3 with the crank sha't't l, which works in the crank casino 5. The head of the cylinder can be integral or removable.

In carrying out the invention, the casting of the cylinder is Yformed at one side with a longitudinal cylindrical valve casing 6, and

the partition between the cylinder andI valve casing is provided with a port' S" at the head of' the cylinder and establishing7 communication between the head end ot" the cylinder andthe outer end of the valve casing. The valve casing 6 is provided near its inner end with an intakeport 9, and between its ends with an exhaust port '10, to communicate with the intake and exhaust 1nani'folds,'re speetively.

A piston or sleeve valve 11` to control the exhaust is slidable within the valve easing 6, having a longitudinal bore or passage eX- tending therethrough from end to end, and the outer end oit the sleeve valve 11 has a seat 12 tor a puppet. valve 13 t'orontrol the intake o'l if'uel seatable away from the port S against said seat to close theopening at the outer end ol? the sleeve 'valve 11. The sleeve valve is provided near its inner end with an inclined or oblique partition 14' and a port 1GV in one side at the lower endV of said partition to register with the port 9. The partition has a depending tubular guide 15 through which the stem 13 offthe valve 3 extends downwardly from Within the valve 11. To operate the valve 1l it is eon nected by a connecting rodl 1'7 with an auf@ iliary valve crank shaft 20 mounted for rof tation within the crank casing. A gear wheel 21 secured1 to the crank shaft `20 meshes with aV gear wheel 22 of one-halfless size secured tothe crank lshaft Ll, whereby the valve crank shaft 2O is rotated once for two revolutions oi the crank shaft 4;' although any other suitable connection bctween the shafts can be used to obtainthis ratio oifrotatioin as usual in a four-cycle engine.v The connecting rod=17 has a forkedl or hiturcated portion 1'8 at one end' having its arms pivoted, as at 18', to the valve 1 1 within. its lower end' andat opposite sides of the guide 15 to provide a compact structure, while the other end of the connecting rod has a i'ork 19 journaled on the crank 20. The puppet valve 13 is unseated by a push rod 23 extending slidably through the tubular connecting' rod 17 with one end of the rod 23 bearing against a shoe 27 secured to the end of the valve stem 13. The rod has a shoe 24 to bear on the shaft 20. A coiled wire expansion spring 25 or other suitable spring is used for holding the valve 13 to its seat, said spring, as illustrated, surrounding the guide l5 and being confined between and bearing against the shoe and a shoulder 26 of the guide. The unseating of the valve 13 is accomplished by a cam 28 care ried by the crank Vof the crank shaft 2() which engages commodates the bearing `15, spring 25, and shoe 27 while the fork 19 accommodates the shoe 24 and cam 28. The cam V28V is so arranged, that during the intake stroke ofthe piston 2, the cam 28 moves under the shoe 24 to lift the rod 23 and stem13 and unseat the valve 13, as will be explained presently. .,Iiiroperation, starting with the position ofy the parts as illustrated, when the piston 2y moves through its intake Astroke away from the head, the crank of shaft 20 moving through the arc marked, Intake, raises the connecting rod 17 and kvalve 11 covering vthe port 10 and bringing the port 16 into register withthe intakeport 9. The turning of the cain28 under theA shoe V24, thus'lifting the stem 13 and valve 13,:and permitting the carbureted air to be sucked into the cylinder by the Vmotion of the piston 2, through the ports 9 and 16, sleeve `valve 11, and port 8. When the piston 2 reaches the end of the intake stroke, the crank of shaft 2O in being moved near its uppermost position, will remove the cain28 from under the shoe 24 so that lthe valve 13 will be seated by the spring 25. When the piston 2 moves outwardly through the compression stroke, the

crank shaftV 20 is moving over the axis of Y ing rod 17 and valve 11,l downwardly,theV

said shaft through the langle marked f Compression, the .valve 11 thus beinin its uppermostV position and `closing the exhaust porty 10, while the valve 13 in closing the port of the valve 11 prevents the escapeof compression. Then, after the piston 2hjas reached` the end of its Compression stroke, and moves through its explosion stroke, the

compressed gas being ignited byY a spark plug or other suitable igniter,the crank otl the shaftv 20V moves through the arc marked .Explosion, thereby pulling the connectvalve 13 remaining seated on the seat, 12

lsince the turning of the crank shaft `2Otothe shoe 24. The fork 18 accrankshaft 20 will move the what is claimed as new is:

ward the left will Vvserve to swing the cam 28 awayrom-the shoe 24..V When thepiston 2 reaches the endV of the explosion stroke and returns during its exhaust stroke, the

.crank of shaft 20 moves under the axis of said shaft through therarc marked Exf haust, whereby the upper Vend of the valveV 11 and valve 13 Will be below thegupper portion of the exhaust port 10, thereby permitting the exhaust gas to escape, but the valve 13 `remains seatedv to prevent the exhaustrom reaching the intake port. The above operation is'then repeated. r

1With this construction, theV exhaust valve 11 is reciprocated once orevery two reciprocations VVof the piston 2, the valve 13 Amoving with the exhaust valve 11, and being opened at the proper time.y This operation of the valves enables the engine to lattainV y a high speed without being handicapped by the sluggish movement of the valves.

Having 'thus Vdescribed the `An engine valve structure embodying a casing `to communicate at one end With Va cylinder and having intake and exhaust ports, one near its other end'and the other between its ends, a sleeve valve slidable within the casing to control the second mentioned valve to communicate with the other port and having a Valve seat near the first mentioned end of the'casing, a puppet valve seatableagainst said seat and having aV spring-pressed stem slidable through the'v sleevel valve, a crank, a connecting rod confV necting said crank and Vsleeve valve,-a push rod slidable in theV connecting rod to move said stem, and a cam carried by'th'e crank and engageable v`with saidmpushrrod 'to unf seat the puppet valve during one movement i 90" Intestiinony thatI claim the foregoing Vas my own,1 have-hereto aii'ii'ied.my Ysignaof the sleeve valve.

ture inV the presenceV of] twowitnesses.

n JiissiirnMrLn CURTIS. Y VWitnesses: I

` Enrri-r FLUGAN,

F. LE Frivim;

invention, ,Y

Copies of thispatentmay be obtained for vebefnts each, kby addressing the ommissvioknerofPatentS, l

" Y Y `v /Washingtomncyl Y 

